xv, 6 Schidtze: Contribution to Coleoptera Fauna 551 
sion with an oblong pale green scale spot. Another spot at 
each side of head. Prothorax slightly broader than long, with 
an indistinct anterior submarginal groove and a strongly pro- 
nounced posterior submarginal groove. Male with two stripes 
discally, from the anterior to the posterior margin, which at 
the anterior margin are confluent, forming an arrow point. At 
the lateral margin another pair of stripes forming an irregular 
oval. Female with a pair of subparallel bands across the disk, 
from one lateral margin to the other. Elytra of male oval, one- 
fourth longer than broad, at the apex rounded ; of female one-half 
longer than broad, apically terminating in a prolonged thorn, 
which is slightly bent downward. Elytra in both sexes punctate- 
striate. Female with two pairs of subparallel bands across the 
disk from one lateral margin to the other, and at the apical third 
another band forming a triangle. The basal pair of bands 
interrupted at the suture but confluent along the lateral margin. 
The anterior and posterior bands of the second pair are curved 
backward at and near the lateral margin, and they recurve 
so as to form the triangular figure apically. In the male the 
basal pair of bands is confluent subsuturally, forming an ir- 
regular, oval figure. A scale spot on each femur near the apex, 
below. Posterior femora of female not reaching beyond the 
apex of the elytra ; in the male reaching well beyond the latter. 
Male, length, 12 millimeters; width, 5.5. Female, length, 15.8 
millimeters; width, 6.8. 
Bucas Island (my collector). Types in my collection. This 
species was also collected on Dinagat and Siargao Islands. The 
markings on the prothorax discally are variable, particularly in 
the male, being sometimes broader. This species is truly re- 
markable on account of the great differentiation between the 
characters of the sexes, and of the first occurrence of its kind 
in the genus Pachyrrhynchus. 
Pachyrrliynchus signatus sp. nov. Plate I, fig. 6, 6a. 
Dark, glossy, iridescent, violet purplish with pale green mark- 
ings, rostrum and legs metallic copper colored. Closely related 
to P. erichsoni Waterh. Head with a small scale spot under 
each eye. Prothorax with a narrow anterior marginal band, 
another somewhat broader band at the middle interrupted dis- 
cally, and traces of a posterior marginal band. Elytra with 
rows of distinct punctures. Each elytron with two large oblong- 
oval spots near the base, one located discally, the other at the 
lateral margin; at the middle a crossband, reaching from the 
first row of punctures to the eighth near the lateral margin. 
